ring blocking
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- chronophotography
- intensifying screen
- optical deformation
- filters
- multilongitudianl-mode laser
- optical harmonic generation
- time-averaged shadow-moire method
- astrospectrograph camera
- visible emissivity
- infra-red beam folower
- frequency summing
- mode pattern
- metacrystalline
- upper state relaxation
- optical head controllers,control ics/modules
- geometrical focus
- diatomic roto
- holographic gratings
- Varotal lens
- push out